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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b8345eab773cfb805e8783342c204e36e286831094e0c516f0bc680621b23c' 
  AND token = 'hyQ3EQZ6Yxfxf7NB0MtKfjUidYdHqIdBbelQSWPSLZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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