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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b3c23b2aa30c856e97c25a85627683d84621395aba5d46b53f02893d5a092b' 
  AND token = 'bH3XzVcuolIToZe07wyQvc0aLJEuo8Tv0u1uBrUu2tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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