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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b091c75d787df612b89e0f75e507a28217d304876e93006d9338e40c6fea967' 
  AND token = 'EIKaNQj/I+4alsSOBeof4ej43PBvhr/TM+AhJ5UJREI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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