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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285249fb44a6accd45bb866faf0a3e82dd0aee7357f96b1d1398adb23914ff9c' 
  AND token = 'XatiXrscBa/fNePwAWo2OmHoCN/rm0s6ZU7Md3KTC+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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