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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784361d16de1d05367511e600dcfa1cb90267ce977e6933eb0914af55ae18bf9' 
  AND token = 'OqJbnUAgUYInTbtFhj3BwQhPBk8L0RlMNCW/SmB0pnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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