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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a32ad7b065231a8e209c1100cf09513ec1857493dbc021403828c0f5261afb' 
  AND token = 'IEu4RSlyMMaE1+EBtYjmgaYsEQ80ktfIGYbQcIc4+QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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