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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de1d4883bb9bc37137b68e98778db366986858dd8a0775b993e53009ff57ec8' 
  AND token = 'euJ4dqVhrrpReU3q1csTVLCf9vGnVtA6vqokNCHgqm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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