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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e93e468fd507263b65eb63803ec972563bdf75cdec0d5d506eec225e8d2c11' 
  AND token = 'cFQEeLPNLl9JeBoYyuW8i9SYeP63FjJG+RfuHuL5P00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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