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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6592aa3d73b6801fbecdfba74f8389de2c673bd7ff6ff416c33295170e410e53' 
  AND token = '55EaWzgPU68MJaGr96ftJ10OfiZkrFwmWxm6yFBmovc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}