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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8d6dea942c524b87f1b5c58785c77ecef307b5487769acbed8944bcc6175e4' 
  AND token = 'xC5rF4Nf1tyf/v7rlxfAMDXRHKWxBow4hg6iM8JWXKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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