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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f2ec102ed4717684b649a28816f833905adc82fc4bb18446b84c3627e85e00' 
  AND token = '93Kq5LfTMs3rCqpK+mt3ZSAqS1ZoS5Q1bT/Rh17cnWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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