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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07139b3f5445a27c8de2dfc05400c8b852a88e18cc82db0d62151835b141bbb' 
  AND token = 'wDwTNYyYVrtiWQJ7/hy22ko3Oy8T+cSRkmL6CFMPtVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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