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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1556214fad854bf67adde637f158abb183960d64e35b7b66a224496e090dac05' 
  AND token = 'nD35srsLhAsHdoFoE11lCTHVWix7iNoHPxAB+heUqXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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