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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137c35b1d905ca6589439617737ee28cf01e5849648a87d53e1771542ceacdca' 
  AND token = 'MZsaTn1GaNqS9lnOLaX6kNsAelgH2Mpfr93dr6G1Vo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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