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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf0d4c2a91eac1cd2bb099b6826fb904578dcce69fac29d1ad2d6e9c70ce1a6' 
  AND token = 'V92euhrxRs288iRYkbL8C4/ExBMtyjekXMeE4j4UXbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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