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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d65b07db8ecee25fd170771bddf3577a1d041f1b360a9321d0c85e92dcee99e' 
  AND token = 'UhwQdbv4LfxdC2IyCn5cgGFeO07leS1v/jh/eQq3p2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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