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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeeea076bf203e97cbbc1632d7be9861b61230335bf818d96cf4a42d91ab082c' 
  AND token = 'T/UqPsRNX0M7ukY5A7ouRAA3nskHddJslLyqnXNjVGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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