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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d359cdecb8ec66530bf7c07d46e0476187878f0ab16a1ed368458c694242b5' 
  AND token = 'dsDlO8FVNf4C7/huz5M3w+tktTms8G3GNvGxGnCXUkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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