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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079fc4e14733b4fbbea155e0dd74bf7c72e7502701f5855453bc437b7319d8ff' 
  AND token = 'lnFEtTE7imYNBbl4IMmgbC6OlvmPQ8VyxROVdep8dEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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