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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a83edcee9fb1a189514b36ef2fc121249d431e62d4793adb7feff5a62d02ea3' 
  AND token = '7Chh/JcZp5+NKzgar9GA7MbD895D4AffdhJ8StGmlZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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