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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea397f8022a66523083c8415aa37f06210ecba9edadf79afb45f7dfd3e45e2a7' 
  AND token = 'dcP4QDYOKqcmOpn/orLZTTC5YTp2G1J0Mt09WJPKoNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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