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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca03b8597af71b76c61887270b7d382168ea4508c98a2291b6b7d276d16bee3a' 
  AND token = 'HFEG4qUSKbaOi3965/vmnix/sg1keJmzgKmXf3LrI04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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