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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2fd6b08f96ba0e09a4bfb05957ad0a16ddef9a5ea93dd56a33ceb6dc5f24147' 
  AND token = 'Fb8DZ3HZ1vZSDWi579dLluEdgBkPsaivOPJn91nr8Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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