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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e461f3eeac659821ae53ddb58c93ddde89be35d6bb7f92ad5ec5362df9900c9e' 
  AND token = '/QAACwT8OWvPUKa7JUxLUjQ5tSKSrDt4UtSAfZS9tKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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