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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac2613ed60a18c60c5d78f60910ca2fd6a980443c3308d7fe7fd868db999d2b' 
  AND token = 'yNtz3bMe0MilpO4ecsqLuIN1LXxPIagJGYUQCJEGqcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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