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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f3609cee9deb3dcd5f24284dc3e566b34d1879002c4733993aea16d210a311' 
  AND token = 'jY56out/MCHSq6U13Yv/8v5TafEj1Fc/ev69h1bHSK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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