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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92fffdcb9fa488f7485ce51a7b399270e4ee703bccf607647010db3f2e601cf' 
  AND token = 'hu+NB1bdTBRbgIPDJ4Q9HXvC0z9owDcS99ny+5zmyts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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