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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ff7002ea0c3d2b8b3a032d2e9ea86594bcb87c612000616fa8b553c6c90dc6' 
  AND token = 'F0fzIH7NI/xdY5eD/UMRQFGu8GV/lVVq21RKQNmoJk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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