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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f75530fe52619dba2d755aede9d747c79df33fa2df41bd6d7b704fa240cedbe' 
  AND token = 'hs4OgpXKHIReDsEWoAeIBrb5QW3+gzfofZBkyTCn/24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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