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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08768354ea451d140154910c4209e60f29260beb455ad84c9b85d53b0e9ff702' 
  AND token = 'wB7JU/3kOJtEgd04Dm1PFAmSGiFRri3LzEZ56FqTW/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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