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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9dc49f071fcf3ca7bfd4035864747781425e812e41d597adb2614d3bd496e3' 
  AND token = 'LHeFy4txWJ2QwXAtLkXIK+PCfxAOqyJ2qqb/q2LTvUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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