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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02bdfa0166160724811ab9777cdb97f1ae1fd169929632dcc3e63ee475c9c428' 
  AND token = 'T4LWOcgskTyB1xmTfOvqP4DkwRn2vt3UEVSbGXQFW14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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