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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8f8943498794bfa5921075fe81f2b04dbff70fb6d7af1babd3098e0dab9eb4' 
  AND token = 'dXAZAVYW4bU4Vo3pad9M/PZouAWazrCf8nOL0YAaFY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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