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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f1a3ef74c1215b3497e5d511dcb29979917ffd269fc7131db2762d0d194ef1' 
  AND token = 'mUELRHJ69oFlDHyHtGd65zJULKomnxuo6bGUj3dY29k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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