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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b639a73ac4743bd64ca55e981599646bb4ee964d01d5dde5261adc5e0a5122' 
  AND token = 'zH1UAAUIyr3m6h7gYRKkl/retxPi8kGbUGQKNb0gCZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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