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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7847114f3cdd8b82844660ce96cd981800a96dac6bae4c6e8e3fe8d37fb7c1' 
  AND token = 'r+NAsD/QUTRxljBa7BmXG8tYc4dW42ad/RWJdYWbvn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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