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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844f5fde962b676b67528758887302d60cf70b61af0f83e9e36602d738840c86' 
  AND token = '+2DvOaaYq/Mt2mgxS1iH2LufQXCzxUPFevRbg3H8tNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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