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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0c01273909ab18ae1a5836e4779b13074bc3ca9444a48a3b20c9643851d4c1' 
  AND token = '1Uy2bIuf72rW9DFdE0xAXlaoaxztYO2foa8w7bv48BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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