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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad842cf7982037aa779213d6c242c822c08fc3de5327dd0e85bdd37d5bf11382' 
  AND token = 'slcKdZqXL6LlrRQYNqVnN6uCjFmHAp9AM8UK85E5m80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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