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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e11f2af8872a5d55fa8d814a447d37c42163b8e66369e82cf71ccaf91b5ce7a' 
  AND token = '6aCghTxnECAbB5Cms4tkCC1WmehbroCGpcL6G7lH+sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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