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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de7d5aa2bf8c19a86d26544e79b1579da867281f19692883af0a8fee5e2bb87' 
  AND token = 'IKL1HfEGmXu/aOs4OBzy42w4q38lPL6eGE2xR5tkZNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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