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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e560112d860f0b64ffedb3e0dfd330e4aac9431c8fb1d284eca6886161cdea6' 
  AND token = 'NWAureBMbVJ/TU4x5EtXqEpmyHyi3bvcQIg2wE4IGhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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