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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be23d209dd0f8272b50846c15163c1e1bb37a7b5e63d7ec6a1bc1873bb3f730' 
  AND token = 'TubiZhK0QhshaYnCTLFinayvibDPLdrs5E9Mupf9VbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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