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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba0c18a99533cde6296c09f4cc85140aa518221de9a09d3a7a2fbd29b193391' 
  AND token = '9xDSEX/7xnWDX7EH56ujZj+/cNzChLMUTGPytzxQQTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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