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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf499996e8ed71a98e3b69a30be66c56b16cb7a4d4b06a184d2577655c318249' 
  AND token = 'B9dmSqK0zEvs5dZlU3sk0osajH8uwAVdJBAQvgrJyAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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