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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8819a654fb7961ade184813ec9fa37d64daaa0c16f98b227862f8cf2a3b5fb' 
  AND token = 'r589TImbSVloeT6IJgwt0SBYI9jPntUKJ3Yk2neSoX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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