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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45e4cbc9242cdfdc02f110490ca7d32dcb119bb336f1b19ea907bc519b5629bb' 
  AND token = '0IGkhe0TDqcCNa1dz5yAebQiyALzd3+vK+/5Y6UMF/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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