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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8037986f821cdaf63a022e59d578ef8e125d9fe1f0b6659c1b89355d1a29af86' 
  AND token = 'WLLZlsi9CF1vPwWWD/9uegNwIiYttcfKsALl9x02u0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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