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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228f27075dc4d82ed699a433ad2d454007525c7d4f1608a91c0725912fbdd984' 
  AND token = 'erOUBl+mPGrQ8Q0+2eMUkgq0i1Ay14GdoGBl74qdhFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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