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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbaf728e7ab621f8d521243fd0eb62261e489be86e9dd784712ec46fa53763fc' 
  AND token = 'AUtBZ8qfpK2KA5giLUY5E2l2MzeYu/kuTzg3xaNNHs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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