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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978e8ec15992cb29ff78ead1877c18e657076bdc885b41cc01788dba9c6728be' 
  AND token = 'vjOg7bU0wBg6bWShZKOXnvTdxruPPyfLtXUpJ4vdWf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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