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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7ae76beb607550a9afbd123fd613ef97711e4ff50b4bc3b2c53845bc683ac2' 
  AND token = 'oScmCq41KzzCc5W3/rd7rtER6asgazFZuduXe1yF82k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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