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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce356bf3bf7e9c1d256ec5e1e26068d4a379e84c3ab6c6227688b987803e19b' 
  AND token = 'VVX+ejoDaVgvexVS1ZxQmGt6mgAJs81cxxh9RX7T0/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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