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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d414f2c0fb0365ce8df7c5743d8f398f424dcf30ce42c97077545c2cfefabb' 
  AND token = 't2ExSBjbTu+SJZAe1t0oJkX8B4uLh2APz6WQCn7gf4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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