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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b0462c853fc8f837d16c242e18e978dd8aed099db948b8699bef32c929d8d76' 
  AND token = 'ujDjyPzGYmfswp8yJupRV25N0tAcQ1HcmOQ5O3gvn44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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