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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7a91817a8d96ce79427c7416b8a6c03b6d22aa2de37bd603b1c069778062ba' 
  AND token = '0CIXU2pBHpfOul3eLsffzXVfPNVtO6iSWyjx3/yTAUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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