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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd692b03afbdb20913f33981c3c47830b668b7b00b64924255b8f841f321f2be7' 
  AND token = '/6djtfLp+Dhwzj1VwpCuV94kFYX3x9TweR6CfH9T4Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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