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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f83052421d719f79758cfb97323e09ab6637daef1ec130105a19490d35588be' 
  AND token = '7ngPUYfkDnJN8vS3I/stckQ4XJ6d8RuvcxDSWib+I84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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