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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c401f5c144657b5b5f85e4dc7fc5ab2a6daa2b4e968ea6f0fd9271b22a4d75' 
  AND token = 'ThiJI+mm1WtT/orAgJPf8fxik4ko/qhNDPsRwyb2Se0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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