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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9931becd7231c10b138e64f14fc8e42d34462da7e40646cad6bb6a1545a65a0c' 
  AND token = 'oDA9NtryBfksSdD3EGzgIHcvl0oQLXMwAItif7I26OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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