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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1511c9e78695f7e12cc739c1d4c6ab5187849c159d79f11e3736703adc578ee' 
  AND token = 'J5IGLKMFc6LtOCGbJD986q/qig/hOqA43cG4ZX/TnCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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