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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b88124ac4f231c9bb6e7e25ed240b248c4dcb1c0f0efbbefa92d7c0e7413a1' 
  AND token = 'yO26dvgL1n1AWLVngzmfzDoS3DcPxT/d1/CrTQ5R8nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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